While this originated in Mankato, MN this can be used worldwide. The midwest is known for having heavy set women, ones that can take a punch. So after a good 'hefty' plowing session, you'll ejaculate on the poor girl's chin, and then punch her in her face. This shows you the toughness of the midwest.

I was banging this bitch, gave her a Mankato shot, she got right back up and asked for more.